package com.xyc.gulimall.ware.service.impl;

import com.alibaba.fastjson2.JSON;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xyc.common.constant.OrderStatusEnum;
import com.xyc.common.exception.NoStockException;
import com.xyc.common.to.mq.OrderTo;
import com.xyc.common.to.mq.StockDetailTo;
import com.xyc.common.to.mq.StockLockedTo;
import com.xyc.common.utils.PageUtils;
import com.xyc.common.utils.Query;
import com.xyc.common.utils.R;
import com.xyc.gulimall.ware.dao.WareSkuDao;
import com.xyc.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.xyc.gulimall.ware.entity.WareOrderTaskEntity;
import com.xyc.gulimall.ware.entity.WareSkuEntity;
import com.xyc.gulimall.ware.feign.OrderFeignService;
import com.xyc.gulimall.ware.feign.ProductFeignService;
import com.xyc.gulimall.ware.service.WareOrderTaskDetailService;
import com.xyc.gulimall.ware.service.WareOrderTaskService;
import com.xyc.gulimall.ware.service.WareSkuService;
import com.xyc.gulimall.ware.vo.OrderItemVo;
import com.xyc.gulimall.ware.vo.OrderVo;
import com.xyc.gulimall.ware.vo.SkuHasStockVo;
import com.xyc.gulimall.ware.vo.WareSkuLockVo;
import lombok.Data;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private WareOrderTaskService wareOrderTaskService;

    @Autowired
    private WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    private void unlockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新库存工作单的状态由"已锁定"变为"已解锁"
        WareOrderTaskDetailEntity wareOrderTaskDetailEntity = new WareOrderTaskDetailEntity();
        wareOrderTaskDetailEntity.setId(taskDetailId);
        wareOrderTaskDetailEntity.setLockStatus(2);//2-已解锁
        wareOrderTaskDetailService.updateById(wareOrderTaskDetailEntity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {

        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params), wrapper

        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录则新增
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.isEmpty()) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            // TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            // 1、自己catch了异常,所以该异常不会向外抛
            // TODO 还可以用什么办法让异常出现以后不回滚？
            try {
                R info = productFeignService.info(skuId);
                if (info.getCode() == 0) {
                    Map<String, Object> skuInfo = (Map<String, Object>) info.get("skuInfo");
                    skuEntity.setSkuName((String) skuInfo.get("skuName"));
                }
            } catch (Exception e) {

            }
            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo skuHasStockVo = new SkuHasStockVo();

            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);

            skuHasStockVo.setSkuId(skuId);
            skuHasStockVo.setHasStock(count == null ? false : count > 0);
            return skuHasStockVo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * <p>
     * 1）、下订单成功，但是订单过期没有支付被系统自动取消、被用户手动取消，都要解锁库存。
     * 2）、下订单成功，库存锁定成功，但是接下来的业务调用失败，导致订单回滚。之前锁定的库存需要自动解锁。
     *
     * @param wareSkuLockVo 库存解锁的场景
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo wareSkuLockVo) {

        /**
         * 保存库存工作单的详情。
         * 追溯。
         */
        WareOrderTaskEntity wareOrderTaskEntity = new WareOrderTaskEntity();
        wareOrderTaskEntity.setOrderSn(wareSkuLockVo.getOrderSn());
        wareOrderTaskService.save(wareOrderTaskEntity);

        //1、按照下单的收货地址，找到一个就近仓库，锁定库存。
        //1、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = wareSkuLockVo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock skuWareHasStock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            skuWareHasStock.setNum(item.getCount());
            skuWareHasStock.setSkuId(skuId);
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasStock(skuId);
            skuWareHasStock.setWareIds(wareIds);
            return skuWareHasStock;
        }).collect(Collectors.toList());

        Boolean allLock = true;
        //2、锁定库存
        for (SkuWareHasStock skuWareHasStock : collect) {
            Boolean skuStock = false;
            Long skuId = skuWareHasStock.getSkuId();
            List<Long> wareIds = skuWareHasStock.getWareIds();
            if (wareIds == null || wareIds.isEmpty()) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发送给MQ
            //2、如果锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁数据，由于去数据库查不到id，所以就不用解锁。
            for (Long wareId : wareIds) {
                //成功就返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, skuWareHasStock.getNum());
                if (count != 0) {
                    //锁住了
                    skuStock = true;
                    // TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity wareOrderTaskDetailEntity = new WareOrderTaskDetailEntity();
                    wareOrderTaskDetailEntity.setSkuId(skuId);
                    wareOrderTaskDetailEntity.setSkuNum(skuWareHasStock.getNum());
                    wareOrderTaskDetailEntity.setTaskId(wareOrderTaskEntity.getId());
                    wareOrderTaskDetailEntity.setWareId(wareId);
                    wareOrderTaskDetailEntity.setLockStatus(1);
                    wareOrderTaskDetailService.save(wareOrderTaskDetailEntity);

                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(wareOrderTaskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(wareOrderTaskDetailEntity, stockDetailTo);
                    //只发id不行，防止回滚以后找不到数据
                    stockLockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend(
                            "stock-event-exchange",
                            "stock.locked",
                            stockLockedTo
                    );
                    break;
                } else {
                    //当前仓库锁失败，重试下一个仓库
                }
            }
            if (!skuStock) {
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }

        //3、肯定全部都锁定成功
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo stockLockedTo) {
        StockDetailTo detail = stockLockedTo.getDetail();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据库关于这个订单的锁定库存的信息。
        //有，证明库存锁定成功了
        //  解锁：订单情况
        //      1、没有这个订单。必须解锁
        //      2、有这个订单。不是解锁库存。
        //          订单状态，已取消：解锁库存
        //                  没取消，不能解锁
        //没有，库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long taskId = byId.getTaskId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(taskId);
            String orderSn = taskEntity.getOrderSn();
            //根据订单号查询状态，远程调用
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo orderVo = JSON.parseObject(JSON.toJSONString(r.get("data")), OrderVo.class);
                if (orderVo == null || Objects.equals(orderVo.getStatus(), OrderStatusEnum.CANCELED.getCode())) {
                    //订单不存在
                    //或者
                    //订单已被取消，才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作单详情，状态1 已锁定但是未解锁可以解锁
                        unlockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                //消息拒绝以后，重新放到队列里面，然别人继续消费解锁。
                throw new RuntimeException("远程服务失败");
            }
        } else {
            //无需解锁
        }
    }

    /**
     * 防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期，结果查订单状态为新建状态，什么都不做就走了。
     * 导致卡顿的订单永远不能解锁库存
     *
     * @param orderTo
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存解锁状态，防止重复解锁库存
        WareOrderTaskEntity wareOrderTaskEntity = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = wareOrderTaskEntity.getId();
        //按照库存工作单找到所有没有解锁的库存进行解锁
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id)
                        .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity l : list) {
            unlockStock(l.getSkuId(), l.getWareId(), l.getSkuNum(), l.getId());
        }
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private List<Long> wareIds;
        private Integer num;
    }

}